TUG T60 optical and swift X-ray archival observations of transitional millisecond pulsar PSR J1023+003

After the discovery of the fast rotating millisecond pulsars (MPS), it was suggested that these sources (are produced) by accretion of matter onto neutron stars in low mass X-ray binary (LMXB) systems. Accretion of matter imposes angular momentum to the neutron star and spins it up to periods of milliseconds. Discoveries of accreting millisecond X-ray pulsars (AMXPs) and transitional millisecond pulsars (TMP) illustrated the expected link between MPSs and LMXBs. PSR J1023+0038 is the first observed TMP that not only experiences both MPS and LMXB phases but also changed its state two times . We performed optical and X-ray observations of this source between 2015/01/01 and 2015/04/30 to investigate any other phase change and define correlation in luminosity between these two bands in different phases. Optical data were collected through TUG T60 telescoped and UBVRI filter. We used 74 data frames with 60 second exposure time in R band for optical analysis. Optical data reduction was done through iraf program and differential photometry method was used by use of 5 comparison star nearby the main source in data frames. Swift XRT telescope archival data for same time interval with optical observations was selected for further analysis. At all 20 swift observation was available for the desired time interval. X-ray data analysis and fitting were done through the HEASOFT program. We fit the data with absorbed powerlaw model with n h parameter fixed. From optical observation, we reach to the mean optical luminosity of 16.31 that is shown no significant change in optical luminosity of the system. X-ray analysis leads to a mean 0.3-10 keV luminosity of 2.63 × 10 33 erg/s that illustrate the system shows no phase change during the observation interval. According to lack of simultaneous observations in two band, we can not define any X-ray/optical correlation.